Alan, I'm kicking myself for leaving off the DEPENDS in add_custom_target as that is the most essential part of what you suggested. Bah!
I tried copying in your changes verbatim and I'm still left with an output that produces IS_INTERROGATE=0. This is on both 3.9.6 (my development machine) and 2.8.12 (my testing VM). Does your version of CMake produce IS_INTERROGATE=1 with your changes? The rationale behind 2.8.12 is this is the version that ships with Ubuntu Trusty and will probably be what's present if a user is simply told to "install CMake" - although 3.5.1 is also available on that platform under the cmake3 package, so I might be able to justify a minimum version of either that or 3.0.1 (which is what's on backports-less Debian Jessie). I'd have to bring it up with the project maintainer to see, but in any case we're trying to follow a "stick with the same minimum version until we encounter a bug we can't work around, then bump the minimum to the version that fixes that bug" approach. Thanks for your suggestions, Sam
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